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The reaction between Br and various ligands with a N, P, As, Sb, O and S donor/acceptor function leads to the complexes n(NO)2>Br, where n = 4 , , >, n = 2 and 3 <, AsEt3, SbEt3>, and n = 1 .The constitution of the compounds is established on the basis of 51V NMR characteristics .The two NO groups occupy cis positions (IR evidence).With isonitriles, X yields the neutral complexes as the main products, which exhibit a normal halogen dependence (X = Cl < Br < I) of 51V shielding. delta(51V) values span a range from +296 (L = THF) to -1100 ppm <1/2 L = Me2P(CH2)2PMe2> relative to VOCl3.Shielding of the 51V nucleus decreases in the order PR3 ca.CNR > > > ; en > dipy, phen > diazadiene> NCR > py > NH2Ph; OPR3 > OSMe2 > OCR2 > THF; and PMe3 > SbEt3 ca.AsEt3 ca. -PPh2 > -AsPh2.This ordering reflects (counteracting) trends in the polarizability and the ? acceptor ability of the ligands.An effect caused by the chelate ring size (5-ring > 6-ring > 4-ring) is also observed and reflects torsional and ring strains. – Key words: Nitrosylvanadium, Vanadium-51 NMR
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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate